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Old 07-29-2014, 10:16 AM   #1
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Jeep 4.0 running 35s

Just bought some of the bushwacker flat fenders an i have way to much clearance. It looks pretty bad bc I'm running 33s with a 4inch suspension lift an I want to run 35s. Not sure if the 4.0 can turn 35s without being regeared. Any suggestions on what I should switch to?

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Old 07-29-2014, 10:21 AM   #2
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I run 35's on a 4.0 auto with a 4 1/2" suspension lift. It's been re-geared to 4.56 and runs fine. I hit around 21000 RPMs at 70mph. You can run 35's, but to run them successfully is going to depend on the gearing and more importantly the rear axle. A Dana 44 will handle 35's but a Dana 35 is pushing the limits and may hand grenade on you if you try and wheel it hard.

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Old 07-29-2014, 10:21 AM   #3
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4.56 and 4.88 are generally preferred for 35's but.....
are you an auto, or a manual, and what gearing do you have now?

I have a 5 speed and the stock axles at 3.55 and it moves my 35's decently on-road I am regearing with new axles but can tell you it will move them, I even start in 2nd.

this is my favorite chart to go by
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Old 07-29-2014, 10:22 AM   #4
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The 4.0 can turn 35s just fine...but it will be lacking offroad and on the highway. Regear options depend on what transmission you have.

Something else to keep in mind...the D35 (that is on most non-rubicon jeeps) is not up to handling the stress of 35s in stock form. If you have a D44, great...but if you have a D35 you may want to reconsider tire sizes, or at least be ready to spend a little money to get the rig reliable. The rear axle and gearing isnt all you should consider when going to 35s. Steering should be addressed, and stock brakes aren't really up to par with that size tire.
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Old 07-29-2014, 10:29 AM   #5
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Pay no attention to charts like those. In the hands of an inexperienced Jeeper, they invariably cause a Jeep to be undergeared.

The reason being is that they only give the RPMs for when the transmission is in its 1:1 drive ratio which means 4th gear if you have a 5-speed, with the Overdrive shut off if you have the newer 4-speed automatic, in 5th gear with a 6-speed transmission, etc. People see the RPMs in those charts and think they're going to get significantly higher RPMs than they'll really see once they shift into 5th gear, or 6th gear with the 6-speed, or the Overdrive with the automatic. The only TJ transmission that chart is accurate with is the 32RH 3-speed automatic.

And 4.56 is hardly ever the optimal ratio for 35" tires.

For 35" tires Tjjeepers03, the correct axle ratio depends on which transmission you have. Which transmission are you running?

But more importantly, do you have the standard Dana 35 rear axle which isn't strong enough for 35" tires, or do you have the stronger Dana 44 rear axle that is? The Dana 35 has a plastic snap-in plug in the differential cover's lubricant fill hole, the stronger Dana 44 has a threaded steel bolt in there.

The first photo shows the Dana 35, the second is of the stronger Dana 44.
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Old 07-29-2014, 10:31 AM   #6
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I've got 5 speed manual. It's got the stock gears in it.
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Old 07-29-2014, 10:34 AM   #7
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Originally Posted by Tjjeepers03 View Post
I've got 5 speed manual. It's got the stock gears in it.
4.88 would be ideal for 35" tires with the 5-speed. I ran that combination for years and I couldn't have asked for a better all-around street and trail ratio.
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Old 07-29-2014, 10:35 AM   #8
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Quote:
Originally Posted by Tjjeepers03 View Post
I've got 5 speed manual. It's got the stock gears in it.
You will want 4.88 gears. The only reason it matters what gears you have now is if you need new carriers or not...but stock can be anywhere from 3.07-3.73. What rear axle do you have?
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Old 07-29-2014, 10:57 AM   #9
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Dana 44
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Old 07-29-2014, 11:12 AM   #10
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You need new front and rear carriers but don't worry about that level of detail since you want the shop installing the new gears to provide ALL of the parts. That way their warranty will cover everything.
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Old 07-29-2014, 11:25 AM   #11
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Thanks for all the info
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Old 07-29-2014, 11:32 AM   #12
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I have a rubicon with a 4.5 lift and the stock 4:10 gears and I have zero problems running 35" tires.
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Old 07-29-2014, 08:38 PM   #13
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I have a rubicon with a 4.5 lift and the stock 4:10 gears and I have zero problems running 35" tires.
There are issues with that far from optimal combination, you're just not paying attention to or able to recognize them.
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Old 07-29-2014, 09:23 PM   #14
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Quote:
Originally Posted by Moyanator View Post
I have a rubicon with a 4.5 lift and the stock 4:10 gears and I have zero problems running 35" tires.
I have 4:56 gears right now with 35's and it's driving me nuts. I had the 4:56 with my 33's and it was spot on. Where you will really notice the difference is going up steep grades and on tough off road trails. I can even tell the difference when starting in first gear, but if I was a flatlander it probably wouldn't bother me that much.

I think the reason you say you have no problems with it is because you haven't experienced what the difference should be.
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Old 07-29-2014, 11:24 PM   #15
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My 4.0l with 35's will take my wife and I to Farmington, NM tomorrow morning! I'm running 4.10 gears, and I plan to run 4.88s per Jerry's recommendation by next spring.
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Old 07-29-2014, 11:54 PM   #16
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Quote:
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I have a rubicon with a 4.5 lift and the stock 4:10 gears and I have zero problems running 35" tires.
I also have 4:10 gears and 35" tires.
I also have a 4:1 tcase and a 6 speed transmission.

Works good but it isn't what the op is running.



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Old 07-30-2014, 12:59 AM   #17
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I feel retarded lol I have a stock 99 4.0l manual I am lifting it 4in and plan on running 33 do I need a regear? I'm getting mixed replies
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Old 07-30-2014, 04:58 AM   #18
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I feel retarded lol I have a stock 99 4.0l manual I am lifting it 4in and plan on running 33 do I need a regear? I'm getting mixed replies
Yes you need to regear unless you can tolerate a gutless rig. 4.56 is the way to go. Good time to also install lockers and a stronger rear axle if you have the D35.
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Old 07-30-2014, 09:07 AM   #19
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I feel retarded lol I have a stock 99 4.0l manual I am lifting it 4in and plan on running 33 do I need a regear? I'm getting mixed replies
The sources saying you don't need to regear for that big of a tire are either clueless or don't know what they're talking about. Can you drive it with 33" tires without regearing? Of course, but you'd quickly hate the much worse performance, added clutch wear, worse mpg, and the loss of 5th gear since you wouldn't be able to use it once installing 33" tires... it'd make the engine RPMs so low at cruising speeds that the engine would lug.
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Old 07-30-2014, 09:14 AM   #20
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I have 4.11s with my 35s now and yes its sluggish on the street. I'll probably be regearing this winter unless start an axle project hopefully this fall and get new gearing then.

I know this is out of the air, but I ran D60s, 5.13s and 42s on stock 4.0 and worked good. It was mainly trail rig but what little street time it saw did good.

The 4.0 will work good, it's all in the gearing and your intended purpose or end use.
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Old 07-30-2014, 10:07 AM   #21
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I have a 02 with 35's, 4.0, 5 speed, 3.73 gears.

I hate how gutless it is. I am getting ready to put in a 8.8 with 4.10's, and will re-gear my front end to 4.10's to match. I don't see going from 3.73 to 4.10's helping much, but it is already in the 8.8, and I have the D30 gears in 4.10 ratio that I am putting in myself. I plan to go to 4.88 as soon as I have the Funds. I ran 33's for a bit with 3.73 and it was ok at best, but still gutless. 35's I have no 5th gear. If I lived in the mountains, I don't think 35's with 3.73 would really even be ok. If it was not for the 8.8 already having 4.10's in it, I would not even consider it. See below for the Two links I use for Gear ratios, One link is stock jeep Trans gearing. the other is where you put in the info.

Stock TJ Specifications - JeepForum.com
Gear Ratio Calculator

Hope it is ok to post the link for the stock Jeep Specs.

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